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Multiple Choice
Which of the following is NOT a criterion used to classify epithelial tissues or glands?
A
Shape of the cells
B
Whether the tissue forms glands
C
Number of cell layers
D
Presence of blood vessels
Verified step by step guidance
1
Understand the criteria used to classify epithelial tissues or glands. These include: (1) the shape of the cells (e.g., squamous, cuboidal, columnar), (2) the number of cell layers (e.g., simple, stratified), and (3) whether the tissue forms glands (e.g., glandular epithelium).
Recall that epithelial tissues are avascular, meaning they lack blood vessels. Nutrients and waste exchange occur through diffusion from nearby connective tissues.
Analyze the options provided in the question. The presence of blood vessels is not a characteristic used to classify epithelial tissues or glands because epithelial tissues are inherently avascular.
Compare the correct answer (Presence of blood vessels) with the other options. The other options (Shape of the cells, Whether the tissue forms glands, Number of cell layers) are valid criteria for classification.
Conclude that the presence of blood vessels is NOT a criterion used to classify epithelial tissues or glands, as epithelial tissues do not contain blood vessels.